\documentclass{article}
% load a bunch of packages; doesn't matter which ones, as long as they're not
% in the current directory
\usepackage{xparse}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{ntheorem}
\usepackage{mathtools}
\usepackage{mdframed}
\usepackage{enumitem}
\usepackage{imakeidx}
\usepackage{hyperref}

\begin{document}
% open a new line here (or anywhere) and type x and then press <Tab>

\end{document}
